Compound gradient coating for electromagnetic levitation-melting centrifugal casting of solar cell silicon chip

The electromagnetic levitation-melting centrifugal casting technology for preparing solar cell silicon chip can reduce production cost significantly. The chip releasing technique is a key method of this technology, while the liquid-phase reaction formation method, reaction sintering method and sol-gel method have also been used for preparing the SiC-Si₃N₄-(Si₃N₄+SiO₂) compound gradient coating on the graphite substrate. The structure and properties of the coating were observed by X-ray diffraction, scanning electron microscopy and interface characteristic measurement.